Process for the production of hydrated aluminosilicates or artificial zeolites.



. subject of the German Emperor,

ROBERT GANS, OF PANKOW, NEAR BERLIN, AKTIENGESELLSCHAFT, 0F

GERMANY, ASSIGNOR T0 J. D. RIEDEL BERLIN, GERMANY.

PROCESS FOR THE PRODUCTION OF HYDRATED ALUMINOSILICATES OR ARTIFICIAL ZEOLITES.

1,131,503, Specification of Letters Patent. No Drawing. Application filed August 4, 1911.

To all whom it may concern:

Be it known that I, Dr. ROBERT GANS, a residing at Pankow, near Berlin, Germany, manufacturing chemist, have invented a certam new and useful Process for the Production of Hydrated Aluminosilicates' or Artificial Zeolites, of which the following is a speci-' I fication.

This invention relates to a process for the production of hydrated alumino-silicates or artificial zeolites the softening of plication to all can be applied. The object of the invention is toproduce zeolites for industrial use of a hard granular structure and to enable hot water to be used in the process of their production.

more especially for use in water, but is of general ap purposes for which zeolites zeolltes are obtained by fusing silicates of alumina with alkali silicate or with alkali or alkali carbonate with the addition of of these melts corresponds,

cold water,

quartz or minerals rich in quartz and leaching the melt with water. The composition according to example No. 1 of the Patent No. 943535, to

3 parts by weight of kaolin, 6 parts b v weight of quartz, 12 parts by weight of sodium carbonate,,and according to example to 2 parts by by weight of weight of alumina, 12 parts weight of sodium carquartz, 2 0 parts by b0nate, z. e., approximately the molecular composition These melts have various disadvantages:

1. The melts on cooling frequently form crystalline non-hydrated silicates, z. e.,'which cannot be converted into zeolites.

2. They- Water whenspecial precautions are taken. The temperature must not exceed beyond from 50 to 70 (3., as otherwise products are formed which easily become slimy. v

3. The size of the grains of the zeolites is often small and the grain 'is of foliated structure; on being poses it breaks up into the finest particles, which unfavorably-afl'ects the filtering elliciency of thefilters. v

4. The hydration of the melts, z. e.

According to Patent No. 943 535 artificial a part of the soda in the can conveniently be treated with 1 but can only'be treated with hot used for technical pur- --are an indication that the process of Serial No. 642,383.

conversion into zeolitic bodies, is only completed after a considerable time, therefore the apparatus must have a fairly' large amount of space.

5. The large quantity of the superfluous soda makes the process expensive.

6. By the alkalinity of the melt the melting tanks become severely corroded.

These disadvantages can be obviated according to the invention, by which zeolites are produced by fusion at. a high temperature of a charge comprising minerals or silicates of alumina, such aspotash-feldspar, leucite, nephelin, phenolite, and the like, which contain combined silica and alkali, and which charge has a molecular composition approximately corresponding to the formula :4 molecules SiOg, 1 molecule A1 0, 4 to 6-molecules soda (N 21 0).

As indicated by the examples given above melt may be replaced by potash contained in the mineral or in the form of potassium carbonate.

The melts thus obtained have the following technical advantages:

1. Much less tendency on cooling to turn into crystalline silicates.

2. They can be hydrated and converted into zeolitic bodies with hot water at from 90 to 100 C. in 2 to 3 hours. q 3. The latter are of a hard, granular structure, do not fall to pieces in the filter and possess a larger size of grain than those formerly obtained.

he necessary requires less space.

5" The lower consumption of alkali carapparatus for hydration bonate cheapens the cost of production.

life of the melting tanks is proor hydration do not assume a plastic condition, but have a hard granular structure. These characteristics of the ultimate product fusion has been properly carried out.

The intermediate product obtained according-to the present process must not be meme with cold water, as otherwise soft Patented Mar. e, 11ers.

and small zeolites are produced. This product must be leached or hydrated for conversion into zeolites by treatment with hot water (advantageously at from 90100 G.) for from 2 to 3 hours, whereby a product is produced quite distinct from those previously obtained. A further advantage, is that by the employment of hot water the sodium silicate which passes into solution is of considerable concentration. It can therefore more readily be recovered.

Examples among the many possible compositions approximately corresponding to the molecular proportion hereinbefore specified are the following:

No.1. 2.0 parts by weight of kaolin, 4.5 parts by weight of potash feldspar, 8.2 parts y weight of sodium carbonate. These proportions correspond to the molecular composition :1 molecules SiO 1 molecule A1 0 5.5 molecules Na O.

The melt must be leached or extracted with hot water by which zeolitic silicates are obtained as hard, large, grains which approximately possess'the molecular compositio n:2 to 3 molecules SiO 1 molecule $1 8 1 molecule (KNM O, 6 molecules 2 No. 2. 2.0 parts by weight of kaolin, 3.5 parts by weight of leucite, 1.0 part by weight of quartz, 8.2 parts by weight of sodium carbonate, (or instead of sodium carbonate" only 7.6 parts by weight of sodium carbonate and 0.8 part by weight of potash). This melt has the same molecular composition as the melt No. 1 and yields also the same zeolites. 1

It will be understood that naturally still smaller quantities of soda may be .used in the melt, with about the same reduction in the quantity of silica, or that also slightly larger quantities of soda and silica or minerals rich in silica still permit of the treatment of the melt obtained with hot water at from 90 to 100 C. v

What I claim as my invention and desire to secure by Letters Patent-1s:

1. A process for the production of hydrated alumino-silicates or artificial zeolites comprising the fusion at a high temperature of a charge initially containing silicates of alumina'having combined silica and alkali 2. A process for the production of hydrated alumino-silicates orartificial zeolites comprising the fusion at a high temperature of a charge initially containing in addition to alumina mineral having combined silica and alkali.

3. A process drated alumino-sili cates or artificial zeolites comprising the alumina combined silica and alkali, which having combined silica and for the production of hy-.

fusion at a high temperature of a charge initially containing silicates of charge has a relatively low content of alkali and silica.

4. A process for the production of hy drated alumino-silicates or artificial zeolites comprising the fusion at a high temperature of a charge initially containing silicates of alumina having combined silica and alkali, and in leaching the resulting melt with hot water.

5. A process for the production of hydrated alumino-silicates or artificial zeolites comprising the fusion at a high temperature of a charge initially containing in addition to alumina mineral having combined silica and alkali, and the hydration of the resulting' melt with hot water.

0. A process for the production of hydrated alumino-silicates or artificial zeolites comprising the fusion at a high temperature of a charge initially containing silicates of alumina having combined silica and alkali, which charge has a relatively low content of alkali and silica and in leaching the resulting melt with hot water.

7. A process for the production of hy-' drated alumino-silicates or artificial zeolites comprising the fusion of a charge initially containing in addition to alumina minerals potash.

10. A process for the production-of hydrated alumino-silicates or artificial zeolites comprising the fusion of 'a charge initially containing in addition to alumina minerals having combined silica and potash, crushing the resulting melt and leaching with hot Water.

11. A new article of manufacture consisting of hydrated alumino-silicates or artificia-l zeolites in a crystalline form in the conditions of. hard grains insoluble in hot Water.

'In testimony whereof presence of two subscribing witnesses.

-DR. ROBERT GANS.

Witnesses:

DR. CORNELIUS MASSAN, GEORG TUTTGA.

I have hereunto signed my name to this specification in the 

